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Respiratory System and Liver Frog Dissection for Biology 110 Penn State Altoona Biology IV.) Respiratory System and Liver 1. Insert a probe into the glottis, and observe its passage into the trachea. Enlarge the glottis by making short cuts above and below it. When the glottis is spread open, you will see a fold on either side; these are the vocal cords used in croaking.
2. Identify the lungs, two small sacs on either side of the midline and partially hidden under the liver. Trace the path of air from the external nares to the lungs. 3. Locate the liver, the large, prominent, dark-brown organ in the mid ventral portion of the trunk.
4. Under the liver, find the gallbladder. Return to Frog Dissection Table of Contents Return to Penn State Altoona Biology Home Page
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